Control of Engine Load via Electromagnetic Valve Actuators

Theobald, Mark A.; Lequesne, Bruno; Henry, Rassem R.

doi:10.4271/940816

Cited by 77 publications

(37 citation statements)

References 11 publications

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“…The increment of the pulse width 1 3 t t − increases valve lift. With the air pressure force A F removed, the valve movement continues until it reaches its peak lift at time 4 t (the valve equilibrium). This ends the open stage.…”

Section: Introductionmentioning

confidence: 99%

“…See [1], [2] and [3]. Infinitely variable valvetrain, often referred as camless valvetrain, includes electro-magnetic ( [4], [5], [6], [7], and [8]), electro-hydraulic ( [9], [10], and [11]), and electro- Manuscript pneumatic actuations ( [12] and [17]}. The electropneumatic valve actuator (EPVA) utilizes the supplied air pressure to actuate either the intake or exhaust valve by electronically controlling two solenoids that regulate the motion of the actuator's piston.…”

Section: Introductionmentioning

confidence: 99%

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An iterative algorithm for model-based predictive control of an Electro-Pneumatic Valve Actuator

Zhu

Schock

2009

2009 American Control Conference

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The benefits of utilizing camless valve actuations for internal combustion engines are primarily due to their ability of significantly improving engine performance. There are mainly three kinds of camless valve actuators: electro-magnetic, electro-hydraulic, and electro-pneumatic valves. This paper focuses on controls of the ElectroPneumatic Valve Actuators (EPVA). The model-based predictive control scheme has been developed for exhaust electro-pneumatic valve actuators to overcome variable incylinder pressure force as a function of engine operational conditions in early publications. But high computational throughput of predictive control makes it extremely difficult for real-time implementation. This paper develops an iterative model-based predictive control scheme for lift control of an exhaust EPVA that significantly reduces computational throughput. The developed iterative control strategy was verified in simulation using an EPVA model that combines mathematical models of exhaust valve and in-cylinder pressure based upon a 5.4 Liter 3 valve V8 engine head.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An iterative algorithm for model-based predictive control of an Electro-Pneumatic Valve Actuator

Zhu

Schock

2009

2009 American Control Conference

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“…To achieve continuous valve timing, lift and duration, camless engines, which include electromagnetic and electrohydraulic mechanisms, are proposed. The electromagnetic mechanisms, such as the GM R&D Magnavalue (Theobald et al, 1994), FEV (Boie et al, 2000), Siemens (Hartke and Koch, 2002), Aura (Schneider, 2001) andMagneti Maralli (Cristiani et al, 2002), can generate continuous variable valve timing and duration, but these devices cause high valve-seating velocities. The electro-hydraulic systems, such as the Ford camless (Wright et al, 1994) and the Sturman systems (Sturman, 1997), can provide fully flexible control of valve events.…”

mentioning

confidence: 98%

Research on the electro-hydraulic variable valve actuation system based on a three-way proportional reducing valve

Liu

Jin

Xie

et al. 2009

Int.J Automot. Technol.

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As the internal combustion engine moves into the 21st century, fully flexible valve actuation systems are being proposed as an enabling technology for advanced internal combustion engine concepts. Electro-hydraulic valve actuator systems are being considered as a potential variable valve technology. Compared to the servo control system, the system using a proportional valve has the advantages of low price, high anti-pollution ability and high reliability. Our research focuses on exploring the dynamic characteristic of the electro-hydraulic variable valve system, which is based on three-way proportional reducing valve. In this paper, the structure and working principles of the system are described. The dynamic mathematical model of the system is derived. From the analysis of a linearized model and dynamic simulation, it is demonstrated that the system will be stable only if the proportional reducing valve has a positive opening. Some structural factors that affect the system's dynamic characteristics, such as input signal, the stiffness of the return spring and the pre-tightening force of the return spring, are studied using AMESim. The experimental results coincide with the theoretical and simulated analyses. Further study shows that the dynamic response can be improved effectively by adopting closed-loop control of valve lift.

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“…These include FEV [21], [22], [24], BMW [19], [25], GM [23], Renault [26], [27], Siemens [28], [29], and Aura [30]. Note that in the idealized action described above, the actuators do no work because they apply force only when the valve has zero velocity.…”

Section: Normal-force Actuator Based Emvd Designmentioning

confidence: 99%

An Electromechanical Valve Drive Incorporating a Nonlinear Mechanical Transformer

Chang¹,

Parlikar²,

Kassakian³

et al. 2003

SAE Technical Paper Series

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Control of Engine Load via Electromagnetic Valve Actuators

Cited by 77 publications

References 11 publications

An iterative algorithm for model-based predictive control of an Electro-Pneumatic Valve Actuator

An iterative algorithm for model-based predictive control of an Electro-Pneumatic Valve Actuator

Research on the electro-hydraulic variable valve actuation system based on a three-way proportional reducing valve

An Electromechanical Valve Drive Incorporating a Nonlinear Mechanical Transformer

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